Maternal occupational exposure to chemicals and child cognitive function

Area of Science:

• Environmental Health
• Neuroscience
• Occupational Health

Background:

• Limited data exist on child neurodevelopment concerning maternal occupational exposure to endocrine-disrupting chemicals (EDCs).
• Existing research primarily focuses on pesticide and organic solvent exposures.

Purpose of the Study:

• To investigate the association between maternal occupational EDC exposure and child neurodevelopment.
• To expand on existing literature by assessing multiple EDC groups using a job-exposure matrix.

Main Methods:

• Prospective birth cohort study of 1058 mother-child pairs (INMA project).
• Job-exposure matrix assigned EDC exposure probability scores to mothers during pregnancy.
• Child cognitive abilities assessed at age 5 using McCarthy Scales of Children's Abilities.
• Adjusted linear regression and random-effects meta-analyses used to determine associations.

Main Results:

• Approximately 24% of women had occupational exposure to at least one EDC group.
• Maternal organic solvent exposure was associated with significantly lower quantitative scores in children (-5.8 points).
• Non-significant trends suggested poorer cognitive performance with exposure to polycyclic aromatic hydrocarbons, phthalates, and other chemicals.

Conclusions:

• Limited evidence suggests a role for maternal occupational EDC exposures in child cognition.
• Further research is necessary to better characterize exposures in pregnant workers.
• Specific associations between organic solvent exposure and lower quantitative reasoning were observed.